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## Homework Statement

A plane electromagnetic wave travels upward. At t = 0, x = 0, its electric field has the value E = 5 V/m and points eastward. What is the wave's magnetic field at t = 0, x = 0?

## Homework Equations

B=B init. sin(kx-wt)

E=E inti. sin(kx-wt)

E=cB

## The Attempt at a Solution

I am pretty stumped on this one. I tried substituting E=5v into the third equation and solving for B, but that doesn't seem like the correct approach. Equations one and two don't seem to be much help since I am only told about what is happening when x and t both =0. Any help here is appreciated.